On my suppressed LR-308, I was over gassed. I recommend an adjustable gas block. It gives you the ability to tune your gun. You can feel the difference with each click or two. I got the SLR rifle works but there are others. Get one with discernible 'clicks' or even more simple- one brand has settings for on, off, and suppressed. My two cents.
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I've replaced the DPMS upper. I'm really not sure what size gas port I have on there now.
Does the rifle have a forward assist? I would just get a AR gas vent. Not only will it bleed off excess gas, but will also keep the junk out of your face when shooting suppressed. Should be about $40.